Other Financial Information (Tables)

3 Months Ended

Mar. 31, 2017

Other Financial Information [Abstract]

Noncash Operating Working Capital (Increase) Decrease

	Three Months Ended March 31
(Thousands of dollars)	2017		2016
Net (increase) decrease in operating working capital other than    cash and cash equivalents:
Decrease in accounts receivable	$	36,246	2,354
Decrease in inventories		4,497	1,667
Decrease in prepaid expenses		17,788	98,888
Decrease in other		–	6,134
Decrease in accounts payable and accrued liabilities		(44,240)	(225,309)	*
Increase in current income tax liabilities		29,127	11,919
Net (increase) decrease in noncash operating working capital	$	43,418	(104,347)
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	3,422	(7,865)
Interest paid, net of amounts capitalized		17,720	1,849
Non-cash investing activities:
Asset retirement costs capitalized	$	565	3,723
Decrease in capital expenditure accrual		12,906	81,858

*  2016 balances included payments for deepwater rig contract exit of $253.2 million.